Fusible safety-plug for boilers.



A. D. TOWNE. vFUSIBLE SAFETY PLUG FOR BOILERS. APPLICATION man MAY1.19|4.

Patented Aug. 17,r 1915.v

WHA/5885s 4o y l at`i2, and Whichhas preferably plug :which will insure thefesca When the Waterbecomesjlbw; e p plug should becoveredovery by'scal onlthe i interior of the`,boiler`. l lj) :1 y A further object oflmy inventiont satof: provide a plug ofthe vtype described "having i is simple in construction and'vvhich isfrela1` l1,15,0,647. j y

e i and" useful ImprovementsinJEusible State of `l'issouri,` have vmade .certai gs for Boilers,` o ffvvhich thelfoll a Specific@i011-` g l 11,2 l i Myf fi;11Veilberl1relates` 'mpwve fusible safetyplugs' `for` oiler`s,`gand sists in the combinations,V constructiV arrangements hereinafdescribed `and e `An object ofmy inventionisnovel means for breaking steam to escape freely through the opening `causedby the melting `of thepl1`1g. 1` "jj f p nlistojleave the crown' sheet there is novv:nothing` y conveyayvaythe heat which is slwnoplie'l `to the plug.l "The"heat""conducting member y 7 therefore conveys heat "very `rapidly to the '-f l [explosive `charge ,8, thus causing the latter i A further object of myinventflonr provide a deviceof the type rdescribedwhich tively `cheap to manufacture.

Other objects and advantages, f in the `following specification and theunovel features of they device `will be particularly l T pointed outin the"appendedclainis"-` e e Mypinventin s3 unsalted' in the' mail u l` rallying drwingsformine; par? @fjthSeLP-.l

plication inWhichQ# l head 3. y The threadedportion 2"`is designd yto enter a threaded opening``4`` in e thefcro sheet 5 of theboilerin the 4usual manner conical shape arranged" tov contain 'afusible i T l e *p mediately 'above `thel `explosive` charge 8` The body portion `l iscompsed* suitable metal such `as fbrass; Th vided with` a central Vbore `prefera alloy 6 provided Vwith a `central conducting rod,` 7 Which extends from the outerfendfof the `fusible member Gpinto the :body ofkfa p e, charge of explosive materialS, `whicfslfi isggcar-` "ried in y a recess `in the upperlportioni off` the fusible alloy 6. {Asiwillbefseen fromaFig;l l a nonconhlucting sheet "9 is disposed im-` f In carrying out `a` body portion 1 Whichi-s :threaded assh'oWn a hexagonal 'l From the, megane "Pat l y y u y @en l2 of alloyforms` urthe'r protectie for" the charge.; f1; t

various" `parte of At bonsidertble` difficulty 1s l2; sometime "Ylfh' gilets.lWhOSelzQrOWl Q11 the ireaching the 'upperfendlof the fusible plug,` f

`and alsofthatV- it `prevents freepassage of p thefscalesoeas l y to permit the heat offthe steanitohaveaC-v cess to the fuSibleplIig,` and to `permit `theA steam'outfof the" boiler if the plug should be H'leltedl l t pQsedjabove thefplug l i I" `It Willfbeappalent thatthe utility off thisl y deviceeliesinthefactjthat the charge 8 tends toimcoverfthe-plugand breakup the sfcalef;` immediately f "after fthe "water"` leaves the l soon as the Watergislovvered sufliciently to he explosionof this charge `blovvsoi` the allows the steamfto` escape dovvnvvardly` therebyf' putting out lire in theusualf mannen ,The crotvnfsheet fvvhieh `"Hifghtj" have been injured bytoohigh jatemperatur f ihfhereby preserved `and there s""`a`lso` n dangeijof an ezqnlosicmevenl with a boile having a @considerable quantity, of scale dis f croWnl/sheet. e. junfenti"` "n contemplates 1l the same time acting" fronibeneath. Y f i y lclaim'z y y "1, InaJ `fusible plug for boilers, a body even Wherethe crown Scale iS IIU 2 good 'conductor nfl htfthere to A`quickly-jreach its ignition temperature.

portion, a fusible alloy carried thereby, an explosive charge carried by said fusible alloy at the upper part thereof, and a conductor having onev end disposed in said explosive charge and the other end projecting through the bottom of the fusible alloy member.

2. ln a fusible plug for boilers, abody portion, a fusible alloy carried thereby, an explosive charge carried by said fusible alloy at the upper part thereof, a conductor having one end disposed in said explosive charge and the other end projecting through the bottom of the fusible alloy member, and a cap sui-mounting said explosive charge.

8. In a fusible plug for boilers, a body portion threaded exteriorly to enter a threaded opening in the crown sheet of the boiler, said body portion being provided with a tapering bore, a core of fusible metal disposed Within said tapering bore, said core having a recess at its top, a charge of explosive material disposed in said recess, a conducting member having one end extending into said charge, the other end extending downwardly through the core, and a cap disposed above the charge for retaining the latter in position.

4:. In a fusible plug for boilers, a body portion threaded exteriorly to enter a threaded opening in the crown sheet of the boiler, said body portion being provided with a tapering bore, a core of fusible metal disposed Within said tapering bore, said core having a recess at its top, a charge of explosive material disposed in said recess, a conducting member having one end extending into said charge, the other end extending downwardly through the core, and a cap disposed above the charge for retaining the latter in position, said cap having a nonconductingsheet disposed immediately adjacent to the explosive charge.

l ALLEN D. TOWNE. lVitnesses i JoBYT. DoDsoN, Cries. F. MACK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

